Update dependency requests-oauthlib to v2

This MR contains the following updates:

Package	Update	Change
requests-oauthlib	major	==1.3.1 -> ==2.0.0

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Release Notes

requests/requests-oauthlib (requests-oauthlib)

v2.0.0

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v1.4.1

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v1.4.0

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backend/requirements.in

@@ -20,4 +20,4 @@ posix-ipc==1.1.1
 PyYAML==6.0.2
 regex==2022.10.31
 requests==2.32.3
-requests-oauthlib==1.3.1
+requests-oauthlib==2.0.0